Improvement in cranes



STATES PATENT OFFICE.

FRANKLIN FARREL, OF ANSONIA, CONNECTICUT.

v .IMPROVEMENT IN CRANES.

Specification forming part of Letters Patent No. 138,876, dated May 13,1873; application filed January 22, 1873.

I the constructionof pivot-cranes; and this object I attain in themanner which I will now proceed to describe, reference being had to theaccompanying drawing, in which- Figure 1 represents the upper and lowerportions of the crane; Fig. 2, a sectional plan on the line 1 2, Fig. 1;Fig. 3, a plan view of the top of the post; Fig. 4, a vertical sectionof the upper end of the post; and Fig. 5, a vertical section of part ofthe lower portion of the crane Fig. 6 being a general outline view ofthe complete crane.

A is the post of the crane, and at the bottom of this post is anextended flange, which rests on a substantial foundation, and ispermanently secured to the same by suitable anchor-bolts, b.

It may here be remarked that, in cranes of this class, it is usual toextend the post downward into the foundation, within which is a step fora pivot-pin at the lower end of the post, so that the latter, with thejib and tie-rods-in fact the whole cranecan be swung around to anydesired position. I have found that a more durable and economicalpivot-crane can be made by permanently securing the post to thefoundation, and so making the jib and its connections that they can beswung around this lixed post.

The jib of the crane consists of two wroughtiron beams, 13 and B, thelower ends of which are snugly fitted and firmlysecured to a substantialcasting, D, which forms the base of the jib, and which has horizontalrollers e 0, bearing against the post A. This base is supported in itsproper vertical position by two rods, G G, which extend one red on eachside'of the post from projections f on the base to a cross-head, H,which is supported by a fixed pivot, h, Fig. 4, on the top of the post,the cross-head having a central recess for receiving this pivot. TierodsH extend from the cross-head to a casting, I, at the outer end of thecrane, as shown in the general view, Fig. 6. The upper end of the jib,composed of the above mentioned beams B B, is also secured to thiscasting, which contains the pulleys for the hoisting-chain. V

i As this casting and its connections at the outer end of the craneformthe subject of a special application for a patent, further reference tothem here will be unnecessary.

The hoisting mechanism of the craneconsists of a wheel, K, having aperiphery adapted to the chain L, which is maintained in proper contactwith the chain-wheel by a follower, M.

This hoisting mechanism also forms the subject of a separate applicationfor a patent; hence it will be unnecessary to explain it more fully.

The shaft to which the chain-wheel K is secured may be driven from acranked shaft through the intervention of such gearing as the size ofthe crane and the weight which it is destined to hoist may suggest.

The chain -wheel and its follower take the place of the usual cumbrouschain-barrel, the slack chain below the wheel being secured into anddriven from a receptacle, w, attached to or forming part of the base D,as the weight hung to lowered.

This is a prominent feature of my invention, and is applicable to allcranes in which the hoisting-gearing is moved about with the crane, andin which a chain-wheel is used as ahoisting-medium in place of a barrel,for no matter what position the crane is turned to, the receptacle andchain-wheel always bear the same relation to each other.

I claim as my invention- 1. The combination, in a crane, of a chainwheelas a hoisting-medium, and a receptacle for receiving the slack chainwhen both wheel and receptacle bear the same relation to each other, nomatter what position the crane may be moved to.

2. The base D of thejib, having rollers for bearing against the post,and a receptacle for receiving the slack chain.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANKLIN FARREL.

Witnesses:

WM. A. STEEL, HUBERT Howsoiv,

the crane is raised or p

